Paper container



ifa. 1e 1926. 1,573,598

W. L. WRIGHT PAPER CONTAINER Filed August 25, 1922 g 1 yl I 5 4 d M f? a? 3d 2d, 4 L

1j tamu@ Patentedl Feb. 16, 1926.

, v4UNITED STATES '1,573,598 PATENT OFFICE.

WILBUB L. WRIGHT, Ol' FULTON, NEW YORK, ASSIGNOB,l T0 OSWEGO FALLS COB- PORATION, OF FULTON, NEW YORK, A CORPORATION. OF NEW YORK.

Application med August 25, 1928. Serial No. 584,168.

,To all whom it may concern:

Be it known that I, WILBUR L.' IVRIGHT, a

citizen of the United Statesr of America, and

vlti

resident of Fulton, county ofOswego, State of New York, have invented certain new and useful Improvements in Paper Containers, of which the following is a specification.

This invention relates to certain improvements in paper containers, and the objects and nature of the invention will be readily understood by those skilled in the art in the light of the following explanations of the accompanying drawings that illustrate what I now believe to be the preferred mechanical expressions or embodiments of my invention from among other forms, constructions and arrangements within the spirit and scope thereof.

An object of the -invention is to provide certain improvements in the end closures, particularly the so-called double bottomspf paper cans, with the ends in view of attaining maximum economy in production and of reducing to the minimum possibility of liquid content leakage land derangement of the closure parts.

Vith these and other objects in view my invention consistsin certain novel features in construction, and in combinations and arrangements, as more fully and set forth and specified hereinafter.

Referring to the accompanying drawings, forming a part hereof.

Fig. 1 is a sectional elevation of a paper can having a double end closure constructed 'in accordance with my invention.

Fig. 2 is a detail vertical section showing the end closure formation of Fig. 1 on an enlarged scale.

Fig. 3 isa sectional elevation of a wound paper tube or barrel having the relatively thin flanged disk and the relatively thick flat disk, inserted in the upper end of the tube, pre aratory to the formation of the complete end closure.

Figs. 4 and 5, are detail sections, on an enlarged scale, showing modified formations.

The barrel or tube 1, is, in the particular example illustrated, cylindrical and formed of sp1rally wound sheet paper material although I do not-wish to so limit my in vention. The barrels of the cylindrical paper vcans of commerce are usually formed on socalled, paper tube winding machines. l`hese tubes or barrels 1, as thus formed, are

particularly usually multi-ply, and comparatively stiffl and strong, and are preferably treated to render the same approximately leak proof.

These paper cans are usually provided with flanged slip covers struck up from sheet paper material, or composed of a length o spirally wound paper tube or barrel hat-'ing an end closure locked therein and thereto by crimping, and if so desired, my hereinafter described invention lcan constitute the end closure of a barrel to form a The crimp 4 is composed of the disky flange 21 and the projecting end 18L of the barrel, and is formed by doubling or forcing said end and flange inwardly and upwardly (by referring to Figs. 1, 2, 4, 5) by a spinning, rolling, swaging or crimping action to mash or compress the paper walls Atogether and tightly seat the inner end 4? of the crimp against the edge portion of the outer face of the outer disk 3 and lock the outer disk in the can as a permanent part of the bottom thereof co-operating with the flanged disk and the barrel 1, to reduce to the minimum possibility of leakage of the liquid contents of the can between the inner surface of the can barrel and the flanged disk 2. The flanged disk 2 is struck up fromrelatively thin sheet paper material wit-h an exterior diameter to permit the disk to be pushed longitudinally into the open upwardl projecting end of the paper barrel l, in t e process of assembling the can parts` in a suitable machine.

The outer disk 3 is cut from relatively thick sheet aper material, so as to be of approximate y over size external diameter with respect to the internal diameter of the flange 2* of the flanged disk. In other words, the diameter of the outer diskis preferably, but sli htly greater than the internal diameter o the flange 2 into which said outer disk is inserted 1n the procunless forcing pressure is applied to slightly expand the flange in driving the outer disk 3 onto and into parallelism with the inner disk 2. When the outer disk is thus driven down onto the inner disk, the flange 2a is expanded into tight intimate approximately merging Contact or engagement with the inner surface of the barrel l...

rIhe outer disk 3 can be thus forced down into the flange 2a and against the disk 2 byV the descending rotating spinning or crimping head of can bottoming and crimping machine, which forms the crimp 4 and compresses the two disks and the crimp 4 tightly together and against the top die plate of the mandrel. The peripheral edge portion of the disk 3 will remain approximately flat or horizontal as in Figs. 1 and 2, if the die plate and head of the machine are flat.

The disk edges 2c, 3b in the completed article can be flared or turned downwardly as in Fig. 4, by employing a die plate of the desired formation; or turned or flared upwardly, see 2d, 3C, Fig. 5, by employing a die plate of the necessary formation.

The problem is to produce a liquid t1ght can, i. e. to reduce to the minimum possibility of liquid leakage through the can bottom, and at the same time, such a construction as to (l) permit quantity production by appropriate machinery, (2) reduce to the minimum the quantity of paper stock or material in each can, and (3) permit the use of the maximum percentage of low grade or comparatively inexpensive paper material in each can.

This problem was solved by providing the outer disk 3 driven in and expanding the flanged disk with the bottom` locking crimp compressed ,against such disk and maintaining the saine in operative position upholding and supporting the disk 2 in such manner that disk 2 cannot sag and tend to open the seam or joint between flange 2a and barrel l, to liquid seepage, and so that the disk 2 faces the disk 3 against contact with the liquid contents of the can, and also against the loosening influence of the minus pressure within the can when a close fitting slip cover is quickly removed from the open end of the can. The outer disk 3 fits within the disk flange 2a, at the base of said flange where it turns or bends down from the flat body of the disk and-expands said flange at 2, Fig. 2, 2, Fig. 4, or 2d, Fig. 5, until the circumferential edge of the disk 3, and the suI'-. faces of the flange 2a and barrel 1, are approximately swaged together or driven into each other, to provide an annular liquid tight joint between the can barrel l and the flan ed disk 2. I

T e pressure applied during the complete seating of the outer disk within the flanged disk and the formation and the locking of the crimp 4, draws the disks and barrel so tightly together as to almost amalgamate the engaging paper materia] around the circumference of disk 3 and almost cause exterior radial bulging of the can barrel annularly around the circumfer-y surfaces' enceof the disk 3. The drawings give anbulging and irons out such a bulge if it.

should be formed. The purpose of the disk 3. is not to either contact or bulge the barrel, but to insure a tight joint between the inner disk flange and/the barrel and to support the flanged disk to maintain such joint against leakage, and by reason of this disk `and the peculiar relation between the disk and locking crimp, I am enabled to form the flanged disk of relatively thin as well as cheaper paper material than heretofore, particularly where formed with a proper surface .or coating at its side that contacts the contents of the can. Any tendency of the disk flange to swell under the `influence of the contents of the can, will tend to tighten the joint compressed between the periphery of disk 3 and the can body. The disk 3, is formed of stiff paper material, relatively thick with respect to the flanged disk, yet as disk 3 is covered from the can contents, by the flanged disk, I can employ cheaper paper material than is neeessary Where the flat or non-flanged disk of a double bott-om, receives or contacts the can contents.

The advantage in my device, is gained by seating the outer disk within the flanged disk before or by the crimping operation so that the crimp is compressed longitudinally of the can against the outer disk. I also gain an advantage by so forming the up or longitudinally inturned portion of the crimp as to provide an annular crimp locking or bracing knee that flares upwardly and inwardly from the intermediate outward annular bulge 4b to the crimp edge 4a that abuts the under surface of disk 3. The annular outward bulge 4b abuts the flange 2L above the doubled crushed lower end thereof embedded Within the crimp, and as the upturned Wall of the crimp Iis compressed upwardly against disk 3 with its upper edge turned outwardly, said knee forms: an. effective lock against opening or release of the crimp. i

The term paper material Iis employed herein in a generic sense to include fibrous sheet material suitable for the purpose, such as paper, paper stock, pulp board, so-called paste board, and the like.

y It is evident that various changes, modifications, variations might be resorted to Without departing from the spirit and scope of my invention and hence I do not wish to limit myself vto the exact disclosures hereof.

Vhat I claim is 1. A paper material container having an end closure embodying a relatively thin annularly flanged inner closure disk Within the container barrel, and an outer flat disk of oversize with respecty tothe diameter of. said annular {ian-ge and driven thereinto against the flanged disk and maintaining radial expansive pressure against the basev portion of said flange andv driving the same. into merging contact with the .inner surface of the barrel to prevent liquid leakage longitudinally of the flange andinner surface of the barrel, the disks being permanently n secured in and to the barrel by a locked crimp embodying a doubled end -portion of the barrel forming an annular knee bearing inwardly against' the outer surface of the rim portion of said oversize disk with the 'inner disk flange crushed Within the doubled end portion of the barrel to lock the inner disk to the outer disk.

2. A paper material barrel' having an internal paper material closure embodying a relatively thin inner disk. having an annular out-turned flange Within the barrel, and a relatively thick oversize outer disk.

facing the outer side of the.: flanged disk.

the inner disk'locked in. and by said crimp..V

and thereby holding the innerdisk to and. gzinst inward movement. from the outery 3. In the method of end closing a paper container barrel, those steps which consist. in longitudinally insertingI a relatively-thin paper-material annularly-flanged. closure disk into the barrel through one end thereof with the disk flange outturnei and fitting the inner surface off the barrel: forcibly driving a relatively-thick oversize: pa er material disk linto said annular 'ange Wit in the barrel to a position parallel with and against the outersurf'ace of the flanged disk, and thereby radially and annularly expanding the base portion of said annular flange against the inner surface of the barrel; and forming the barrel end and flange under swaging compressing force .into a locked crimp against the outer surface of said oversize disk With the inner disk flange upset vand locked within the barrelend.

Signed at Fulton, New York, this 23d day of August, 1922.

. WILBUR L. WRIGHT. 

